Cross-correlations between monthly averages of solar-interplanetary indices from 1971 to 1978
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Cross-correlations between monthly averages of solar-interplanetary indices from 1971 to 1978

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    The correlations between certain indices describing various forms of solar activity, and between those indices and indices that measure interplanetary or terrestrial consequences of solar activity are described here. A limited set is specified, especially with respect to terrestrial consequences. Included are sunspot number, calcium plage area index, 10.7 and 21 cm radio flux, geomagnetic aa index, average solar wind speed, and 27 day recurrence index. The indices themselves are described, and the cross-correlations are computed for various time lags, or phase differences between the two indices in order to find that lag for which the (absolute value of the) correlation maximizes. A plot is produced for cross-correlation versus phase, and a scatter plot and data overlay plot are given for the lag at which the cross-correlation maximizes. The purpose of this summation is to demonstrate the large in phase correlations that exist amongst the solar activity indices in monthly averages, and the moderate correlations that exist amongst the various other combinations of indices. The time period covered is roughly mid-1971 to mid-1978, but evidence exists elsewhere (Dobson, et al., 1974; Cook, e_t al♦, 1980; Allen, 1982) that many of the results are independent of the time period covered. It should be clear that no systematic variations between more than one solar cycle can be deduced with this abbreviated data set.
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